UISafeArea.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace UTJ
{
    // Attach on "stretch" type anchor
    
    public class UISafeArea : MonoBehaviour
    {
        [SerializeField] private bool constrainX = true;
        [SerializeField] private bool constrainY = true;

        private void Start()
        {
            RefreshSafeArea();
        }

        private void RefreshSafeArea()
        {
            Rect safeAreaRect = UnityEngine.Device.Screen.safeArea;

            Vector2 anchorMin = safeAreaRect.position;
            Vector2 anchorMax = safeAreaRect.position + safeAreaRect.size;

            anchorMin.x = this.constrainX ? anchorMin.x / UnityEngine.Device.Screen.width : 0f;
            anchorMax.x = this.constrainX ? anchorMax.x / UnityEngine.Device.Screen.width : 1f;
            anchorMin.y = this.constrainY ? anchorMin.y / UnityEngine.Device.Screen.height : 0f;
            anchorMax.y = this.constrainY ? anchorMax.y / UnityEngine.Device.Screen.height : 1f;

            RectTransform rectTransform = GetComponent<RectTransform>();
            rectTransform.anchorMin = anchorMin;
            rectTransform.anchorMax = anchorMax;
        }
    }
}